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★★★If 3 + 2 = 5 then 5 − 2 = 3 and 5 − 3 = 2.
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Answer: 7
Adding and subtracting together · Numbers & Operations
Turn one addition into two subtractions, and one subtraction into two additions.
If 3 + 2 = 5 then 5 − 2 = 3 and 5 − 3 = 2.
This is step 1 of unit 12, “Adding and subtracting together”, in Stage 2: Numbers to 100, carrying and borrowing (ages 7–8). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.